KAl'U) CUIEEK SECTION. 125 



five or six miles throug'li a canon whose sides are almost vertical walls of 

 the sedimentary series. The dij), though varying and increasing in the 

 lower end of" the canon near the Red Beds, is not very great, being 15"^ or 

 20°, and the rocks can therefore be studied with considerable ease. The 

 accompanying section is derived from the walls of the cafion. 



In ascending order the detailed section is as follows, adhering to the 

 numbers of the beds as given in the above cross-section : 



Carboniferous. 



Feet. 



3. Limestone, pink, gray at top and weatlierini;- as tliougli slightly argillaeeous. 35 

 Limestone, piuk and yellowish, shaly ; containing some eyathophylloid corals . 40 



4. Limestone, gray or white, very massive ; forming clifts 1.50+ 



Silicions limestone, pinkish in coloi', brecciated; weathering in reddish 



streaks 175+ 



5. Silicious limestones and sandstones alternating in thiu beds, pink and red- 



dish in color 200+ 



Impure, massive, white sandstone, stained red 40 



Massive, brecciated sandstone, stained red 30 



Red sandstone, stratified in well-marked strata 40 



The section agrees in the main with the typical Carboniferous section, 

 but the base of the Carboniferous is here thicker than elsewhere in the 

 Hills, and is at the same time a more massive and pure limestone. 



The interstratified sandstones and limestones of the upper Carbonifer- 

 ous are shown near the mouth of Rapid Creek in great detail, and because 

 of the interest attaching to these beds a careful section was made of the 

 exposure as follows, in descending- order : 



Bed Beds. 



Feet. 



19. Limestone, purple 25 



18. Clays, deep red 100 



Carboniferous. 



17. Sandstone, white and stained red, distinctly stratified 40 



IC. Sandstone, variegated, dee}) red ; showing no sti'atification 30 



15. Sandstone, wliite and massive, stained red 40 



14, Limestone, pink 3 



13. Sandstone, white and pinkish 3 



12. Sandstone, argillaceous and calcareous, becoming a pink and white sand- 

 stone 24 



11. Limestone, purple, impure and argillaceous 3 



